#include <iostream>
#include <algorithm>
using namespace std;

const int N = 110;

int arr[N], n;

int main()
{
	cin >> n;
	
	for (int i = 0; i < n; i++)
		cin >> arr[i];
	sort(arr, arr + n);
	
	cout << arr[n - 1] - arr[0] << endl; 
	
	return 0;
}
